character: Bob the Blood Cell
topic: Circulation and the Heart's Role
grade: 10
subject: Biology
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character: Carl the Capillary
topic: Gas Exchange and Nutrient Transfer
grade: 10
subject: Biology
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character: Valentina the Vein
topic: Returning Blood to the Heart
grade: 10
subject: Biology
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character: Henry the Heart
topic: Heart Structure and Function
grade: 10
subject: Biology
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